Present or future obligation - All visitors must turn off their mobile phones., No present or future obligation - You don't have to/don't need to/needn't pay to send an e-mail., Past obligation - Yesterday, Sam had to buy more stamps., No past obligation - I learnt a little Italian, but everyone spoke English, so I didn't have to/didn't need to use it., Request / permission - Could I open the window, please?, Ability - He can speak several languages., Possibility - It might rain at the weekend. , Advice - You should say sorry to your mum. ,

*Modals 2 Rules & Examples

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